Does anyone know where I can get specifications on the Hydra or RPI Protocol? This is a protocol used by old PRTU3000 RTUs once manufactured by a company called DAQ Electronics in Piscataway, NJ. Thanks for any help you can provide.

 

Have you tried emailing DAQ? They have a website at www.daq.net

 

David, There is a probability it may be a variant of Modbus RTU -- can't say i've heard of it but that is always a possibility. John Weber Software Toolbox